Is there a way to see the script inside of any of the pre-made Blender modules?
The majority of the game engine is not Python. It is written in C, and as a result it is compiled into the engine and cannot be viewed as 'python.'

I'm guessing you're looking at the Geodesic Chess blends, in which case nearly all of the scripts are in the Scripts folder rather than inside the blend. The non-script modules include:


bge (built into Blender Game Engine)
mathutils (built into Blender and Blender Game Engine)
os (built into python, for accessing files)
json (built into python, converts python dictionaries into nicely formatted text files)


Documentation for them can be found by clicking on the links above. You may also want to look at Reading the BGE API.



As for the unreadability of blend files, this is because it is stored as binary data, which cannot be read as text (well it can, but as you have discovered, it is meaningless).